Thanx, Neil. It works fine. It seems that cygwin uses the members c_ispeed and c_ospeed of struct termios and ignores any speed flag in c_cflag. Martin -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/